.page-about {
  --ab-cy-soft: rgba(0, 240, 255, 0.16);
  --ab-em-soft: rgba(255, 90, 31, 0.16);
  --ab-track: rgba(0, 240, 255, 0.22);
  padding-top: 24px;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb-wrap {
  padding-bottom: 8px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-bottom: 8px;
}

.page-about .ab-hero-grid {
  display: grid;
  gap: 28px;
  align-items: center;
}

@media (min-width: 940px) {
  .page-about .ab-hero-grid {
    grid-template-columns: 1.06fr 0.94fr;
    gap: 56px;
  }
}

.page-about .ab-hero-title {
  margin: 16px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 8.6vw, 82px);
  line-height: 1;
  letter-spacing: -0.012em;
  color: var(--text);
}

.page-about .ab-hero-title em {
  display: block;
  font-style: normal;
  color: var(--cyan);
  transform: skew(-4deg);
  transform-origin: left center;
  text-shadow: 0 0 28px rgba(0, 240, 255, 0.34);
}

.page-about .ab-hero-lead {
  max-width: 60ch;
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

@media (min-width: 768px) {
  .page-about .ab-hero-lead {
    font-size: 17px;
  }
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% 95%, 91% 100%, 0 100%);
}

.page-about .ab-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(198deg, rgba(11, 14, 20, 0) 38%, rgba(11, 14, 20, 0.88) 100%);
}

.page-about .ab-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .ab-hero-media figcaption {
  position: relative;
  z-index: 1;
  margin: -34px 18px 14px;
  padding-left: 10px;
  border-left: 2px solid var(--ember);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 数据条 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--line-soft);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .ab-stat {
  padding: 18px 18px 20px;
  background: var(--panel);
}

.page-about .ab-stat dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.page-about .ab-stat dd {
  margin: 10px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .ab-stat-v {
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-stat-unit {
  font-size: 13px;
  color: var(--cyan-ink);
}

.page-about .ab-stat:nth-child(2n) .ab-stat-v {
  color: var(--ember);
}

.page-about .ab-stat:nth-child(2n) .ab-stat-unit {
  color: var(--ember-ink);
}

/* ---------- 章节锚点条 ---------- */
.page-about .ab-anchorbar {
  margin-top: 40px;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: rgba(18, 24, 35, 0.55);
}

.page-about .ab-anchor-inner {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 10px 0;
  scrollbar-width: none;
}

.page-about .ab-anchor-inner::-webkit-scrollbar {
  display: none;
}

.page-about .ab-anchor {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .ab-anchor b {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .ab-anchor:hover,
.page-about .ab-anchor:focus-visible {
  color: var(--text);
  border-color: var(--line);
  background: rgba(0, 240, 255, 0.08);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  padding: 64px 0;
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: 96px;
}

@media (min-width: 900px) {
  .page-about .ab-chapter {
    padding: 104px 0;
  }
}

.page-about .ab-chapter-grid {
  display: grid;
  gap: 18px;
}

@media (min-width: 900px) {
  .page-about .ab-chapter-grid {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}

.page-about .ab-chapter-index {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

@media (min-width: 900px) {
  .page-about .ab-chapter-index {
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
    position: sticky;
    top: 104px;
  }
}

.page-about .ab-index {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 8vw, 76px);
  font-weight: 700;
  line-height: 0.85;
  color: var(--cyan);
  opacity: 0.55;
}

@media (min-width: 900px) {
  .page-about .ab-index {
    color: transparent;
    -webkit-text-stroke: 1px var(--cyan);
    opacity: 1;
  }
}

.page-about .ab-index-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ember);
}

.page-about .ab-chapter-title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(27px, 5vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .ab-lead {
  max-width: 66ch;
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--text-dim);
}

@media (min-width: 768px) {
  .page-about .ab-lead {
    font-size: 17px;
  }
}

.page-about .ab-p {
  max-width: 68ch;
  margin: 22px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .ab-link {
  color: var(--cyan-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 240, 255, 0.4);
  padding-bottom: 1px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 使命区块 ---------- */
.page-about .ab-mission {
  position: relative;
  overflow: hidden;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 150% at 0% 0%, var(--ab-cy-soft), transparent 58%),
    radial-gradient(95% 130% at 100% 0%, var(--ab-em-soft), transparent 62%),
    linear-gradient(180deg, var(--panel), var(--void));
}

@media (min-width: 768px) {
  .page-about .ab-mission {
    padding: 34px 36px;
  }
}

.page-about .ab-mission::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 52px 52px;
}

.page-about .ab-mission p {
  position: relative;
  max-width: 64ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .ab-mission p:last-child {
  margin-bottom: 0;
}

.page-about .ab-quote {
  margin-top: 22px !important;
  padding-left: 16px;
  border-left: 2px solid var(--ember);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.4vw, 28px) !important;
  line-height: 1.4 !important;
  color: var(--text) !important;
}

/* ---------- 标签页 ---------- */
.page-about .ab-tabs {
  margin-top: 6px;
}

.page-about .ab-tabs .tablist {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  scrollbar-width: none;
}

.page-about .ab-tabs .tablist::-webkit-scrollbar {
  display: none;
}

.page-about .ab-tabs .ab-tab {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .ab-tabs .ab-tab:hover {
  color: var(--text);
  border-color: var(--cyan);
}

.page-about .ab-tabs .ab-tab[aria-selected="true"] {
  color: var(--void);
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.page-about .ab-tabs .ab-tab:focus-visible {
  outline: 2px solid var(--violet-ink);
  outline-offset: 3px;
}

.page-about .ab-tabpanel {
  padding-top: 22px;
  animation: ab-fade 320ms var(--ease);
}

@keyframes ab-fade {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .ab-aud-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.2vw, 26px);
  line-height: 1.25;
  color: var(--ember-ink);
}

.page-about .ab-tabpanel > p {
  max-width: 66ch;
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text-dim);
}

.page-about .ab-aud-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-aud-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .ab-aud-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 图文 ---------- */
.page-about .ab-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  overflow: hidden;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-figure figcaption {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 步骤列表 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r);
  background: linear-gradient(150deg, var(--panel-2), var(--void));
}

@media (min-width: 768px) {
  .page-about .ab-step {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 20px;
    padding: 22px 24px;
  }
}

.page-about .ab-step-n {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

@media (min-width: 768px) {
  .page-about .ab-step-n {
    font-size: 28px;
  }
}

.page-about .ab-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .ab-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 数据卡 ---------- */
.page-about .ab-data-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 26px 0 4px;
}

@media (min-width: 900px) {
  .page-about .ab-data-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .ab-data-card {
  position: relative;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(160deg, var(--panel-2), var(--void));
  overflow: hidden;
}

.page-about .ab-data-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(123, 43, 255, 0.34), transparent 72%);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.page-about .ab-data-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-data-num i {
  font-style: normal;
  margin-left: 3px;
  font-size: 0.44em;
  color: var(--cyan-ink);
}

.page-about .ab-data-k {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

@media (min-width: 760px) {
  .page-about .ab-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .ab-team-item {
  position: relative;
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--ember);
  border-radius: var(--r-sm);
  background: var(--panel);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .ab-team-item:hover {
  border-color: var(--line);
  border-left-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .ab-team-n {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--ember);
}

.page-about .ab-team-k {
  display: block;
  margin: 6px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--text);
}

.page-about .ab-team-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--text-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  padding-left: 30px;
  margin-top: 8px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--violet), var(--ember));
  opacity: 0.72;
}

.page-about .ab-node {
  position: relative;
  margin-bottom: 12px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  background: var(--panel);
  transition: border-color 200ms var(--ease);
}

.page-about .ab-node:hover {
  border-color: var(--line);
}

.page-about .ab-node[open] {
  border-color: rgba(0, 240, 255, 0.42);
}

.page-about .ab-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  min-height: 48px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-node summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-node summary:focus-visible {
  outline: 2px solid var(--violet-ink);
  outline-offset: 2px;
}

.page-about .ab-node-dot {
  position: absolute;
  left: -30px;
  top: 20px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--void);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.55);
}

.page-about .ab-node:nth-child(2n) .ab-node-dot {
  border-color: var(--ember);
  box-shadow: 0 0 12px rgba(255, 90, 31, 0.5);
}

.page-about .ab-node-season {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--text);
}

.page-about .ab-node-tag {
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan-ink);
}

.page-about .ab-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-node[open] summary::after {
  content: "−";
  color: var(--ember);
}

.page-about .ab-node-body {
  padding: 0 16px 18px;
}

.page-about .ab-node-body p {
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 8px;
}

@media (min-width: 720px) {
  .page-about .ab-eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    padding-bottom: 20px;
  }

  .page-about .ab-eco-card:nth-child(2n) {
    margin-top: 20px;
  }
}

.page-about .ab-eco-card {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(152deg, var(--panel), var(--void-deep));
  overflow: hidden;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .ab-eco-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 62px;
  height: 62px;
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.2), transparent 70%);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.page-about .ab-eco-card:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .ab-eco-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-eco-title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .ab-eco-dir {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 服务承诺 ---------- */
.page-about .ab-promise {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(95% 130% at 100% 0%, var(--ab-em-soft), transparent 58%),
    radial-gradient(90% 120% at 0% 100%, var(--ab-cy-soft), transparent 62%),
    linear-gradient(180deg, var(--panel), var(--void));
}

@media (min-width: 768px) {
  .page-about .ab-promise {
    padding: 30px 32px;
  }
}

.page-about .ab-promise-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

@media (min-width: 800px) {
  .page-about .ab-promise-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }
}

.page-about .ab-promise-list li {
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
}

.page-about .ab-promise-list li:nth-child(2n) {
  border-left-color: var(--ember);
}

.page-about .ab-promise-list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--text);
}

.page-about .ab-promise-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--text-dim);
}

.page-about .ab-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tabpanel {
    animation: none;
  }

  .page-about .ab-team-item:hover,
  .page-about .ab-eco-card:hover {
    transform: none;
  }
}
</main>